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Securities (Details 3) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Available-for-sale securities          
Impairment losses recognized in earnings on other-than-temporarily impaired securities $ 182,000 $ 178,000 $ 182,000 $ 178,000  
Non-credit-related losses other-than-temporary impairment on available-for-sale securities 240,000 3,951,000 240,000 3,951,000  
Credit related other-than-temporary impairment recognized in earnings          
Fair value of total securities available-for-sale 7,044,571,000   7,044,571,000   9,205,989,000
Total debt securities
         
Credit related other-than-temporary impairment recognized in earnings          
Balance, beginning of period 3,676,000 17,369,000 16,486,000 17,531,000  
Subsequent credit-related impairment 182,000 178,000 182,000 178,000  
Reduction for securities sold or redeemed     (12,761,000)    
Reduction for increase in expected cash flows on securities for which OTTI was previously recognized (204,000) (181,000) (253,000) (343,000)  
Balance, end of period 3,654,000 17,366,000 3,654,000 17,366,000  
Fair value of total securities available-for-sale 7,039,436,000   7,039,436,000   9,204,288,000
Non-agency CMOs
         
Credit related other-than-temporary impairment recognized in earnings          
Fair value of total securities available-for-sale 45,327,000   45,327,000   61,513,000
Variable rate non-agency CMOs
         
Credit related other-than-temporary impairment recognized in earnings          
Fair value of total securities available-for-sale 34,600,000   34,600,000    
Other-than-temporarily impaired securities 6,200,000   6,200,000    
Credit Impairment losses recognized in earnings on other-than-temporarily impaired securities 200,000 200,000 200,000 200,000  
Fixed rate non-agency CMOs
         
Credit related other-than-temporary impairment recognized in earnings          
Fair value of total securities available-for-sale 10,700,000   10,700,000    
Other-than-temporarily impaired securities $ 0   $ 0